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Finding the Fourth Proportional to 2,109.80, 3,161.64 and 809.84

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Solution

The fourth proportional to 2,109.80, 3,161.64 and 809.84 is: 1,213.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,109.80 : 3,161.64 = 809.84 : x
  2. Step 2: Convert to fraction form
    2,109.80/3,161.64 = 809.84/x
  3. Step 3: Cross multiply
    2,109.80x = 3,161.64 × 809.84
  4. Step 4: Simplify right side
    2,109.80x = 2,560,422.54
  5. Step 5: Solve for x
    x = 2,560,422.54/2,109.80
  6. Step 6: Final answer
    x = 1,213.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.